OPTIMIZATION OF VIBRATION ISOLATION MOUNTS FOR APPLICATION TO SHIPBOARD DIESEL ENGINES

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Authors
  1. Muravyov, A.
  2. Hutton, S.G.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);British Columbia Univ, Vancouver BC (CAN) Dept of Mechanical Engineering
Abstract
The report considers the problem of optimizing isolation mounts for application to ship-board diesel engines. Commonly used isolators are fabricated from elastomeric materials that have complex frequency-dependent stiffness properties. Such properties may be modeled using visco-elasticity theory. A literature review in this area is presented. A numerical procedure for the determination of the complex moduli of the isolator materials is given. The procedure uses, as input information, the measured characteristics of transmissibility and finite element modeling to determine the complex moduli. Using this procedure, constitutive properties of five elastomeric materials are determined. An analysis of the steady-state vibration response of viscoelastic systems is developed. The analysis developed allows the formulation of the response of an engine on its isolators to be set in a finite element context and the appropriate equations developed. A derivaton of the equations defining the motion of an internal combustion engine supported upon a flexible foundation is presented. This development includes the full effect of time-dependent inertial terms that are caused by the rotating and reciprocating engine components. Using the developed equations numerical results are presented to compare the steady-state response of a typical engine when supported by different isolators. TRUNCATED
Keywords
Vibration isolation;Resilient suspension;Diesel engine vibration;Viscoelasticity
Report Number
DREA-CR-97-437 — Contractor Report
Date of publication
01 Apr 1997
Number of Pages
110
DSTKIM No
98-00577
CANDIS No
507255
Format(s):
Hardcopy;Document Image stored on Optical Disk

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